Portable, extensible, and retractable mast.



F. JAEGER 6: A; SIEWBRT. PORTABLE, EXTENSIBLE, AND RETRACTABLE ms'r.

APPLIGATIOH FILED APR. 24, 1909;

Patented Dec 27, 1910.

2 SHEETS-811211131.

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F. JAEGER a; A. SIEWERT. PORTABLE, BXTENSIBLE, AND RETRACTABLE MAST.

APPLICATION II LED AIL 24, 1908.

Patented Dec. 27, 1910.

2 SHEETS-SHEET 2.

ontoons and observation UNITED STATES PATENT OFFICE.

FRITZ JAEGER, OF MAGDEBURG, AND ALEXANDER SIEWERT, 0F WILMERSDORF, NEAR BERLIN, GERMANY; SAID JAEGER ASSIGNOR TO SAID SIEWERT.

PORTABLE, EXTENSIBLE, AND RETRACTABLE MAST.

T 0 all whom it may concern:

Be it known that we, FRITZ J AEGER, a sub ject of the German Emperor, residing at 1 Helmholtzstrasse, Magdeburg, Germany, and ALEXANDER SIEWERT, a subject of the German Emperor, residing at 156 Kaiser Allee, VVilmersdorf, near Berlin, Germany, have invented a new and useful Improvement in Portable, Extensible, and Retractable Masts, of which the following is a specification.

This invention relates to the construction of masts or supports adapted for the purpose of signaling, as suports for heliographs, for fixed and transportable wireless telegraphy stations, and as supports for signaling fires, posts for artillery and so forth.

According to the present invention, use is made in the construction of these masts or supports, of flexible metal strips rolled upon drums. This material is very light and can, in consequence of its ribbon shaped flexible nature, be carried in a very small space by windin upon drums, so that for the purpose 0 transport, even in countries which are distant from civilization, no serious difficulty occurs.

The invention is further adapted specially for transportable masts of all kinds, includ ing masts which can be telescoped or drawn apart, as for instance for posts or mastsfor various military and life saving purposes.

For the purpose of constructlng such masts according to this invention, the aforesaid metal strips are wound off the drums, in such a manner that they combine with one another into constructions of such sections as to be of very great resistance to pressure,

and in which they are prevented from bending owing to the sectional shape, and from crumpling or folding by the use of suitable cross pieces. In this construction any serious riveting and screwing work for the construction of the mast is avoided and consequently no special mechanical skill is requisite, and the constructions can be erected quickly and without mechanical knowledge by any handy man.

Several constructions accordin to this invention are illustrated in the rawings in 8 figures.

In these drawings Figures 1 to 3 show a transportable mast with the coiling drums Specification of Letters Patent. Application filed April 24, 1909.

Patented Dec. 27, 1910. Serial No. 492,078.

and a gearing for the elevation of the mast, in sectional view, front elevation and end view respectively. Figs. 4 and 5 show the mechanism on an enlarged scale in section and plan respectively. Fig. 6 shows a special construction of the flexible strip on an enlarged scale. Figs. 7 and 8 show a typical construction of mast in elevation and plan respectively.

The transportable mast is illustrated in Figs. 1 to 8. The letter 70 indicates a movable support. The two wide strips a are coiled upon drums h, and the four narrower strips 6 perpendicular to the strips a, are coiled upon drums z'. The advance of the strips a is effected by means of a worm n which engages in slots m in the strips. Instead of these slots there might be provided corresponding projections. The screw or worm a may be actuated by hand or power by means of the gear 0. By means of the guide rolls p, the strips or. are passed through a guide plate 9 into the proper shape and held at a suitable distance with regard to the screw. The strips 2) are guided by the rollers s. For the uniform winding up or down of the strips there are provided gear wheels 25, which are actuated by means of a crank or the like. The bands are connected together at the upper end so that the raising of one or some of them effects the raisin of the others. The cross pieces a rest p' ed up one upon another upon a plate '1) when the mast is coiled up, and on its extension they are carried up one after another and secured at the requisite hei ht. For this purpose they may be secur to ropes (not shown) at predetermined distances apart. The mast 1s also stayed in case of need by ropes w or the like.

In Figs. 7 and 8 rods f parallel to the axis of the mast are secured to cross ieces. These rods rest against the strips an prevent them from bendin out between two cross pieces. They are formed as channels in the construction illustrated, and moreover each channel has a greater diameter than that underneath it, so that all the channels, when the mast is rolled up, can slide one within another. Instead of this shape, the rods f might also have any other convenient shape which enables them to be drawn in or side by side when the cross pieces are piled up.

WVhat We claim is:

1. An extensible mast composed of a plurality of flexible, coilable metal strips detachably assembled parallel to a common axis and at an angle one to another, and rigid metal cross pieces placed at intervals perpendicular to said axis surrounding and retaining the flexible strips in position.

2. An extensible mast composed of a plurality of flexible metal strips detachably assembled parallel to a common axis and at an angle one to another and adapted to be taken apart and coiled for transport, and rigid metal cross pieces placed at intervals perpendicular to said axis surrounding and retaining the flexible strips in position when the mast is erected.

3. An extensible and retractable mast composed of a plurality of flexible metal strips detachably assembled parallel to a common axis and at an angle one to another and adapted to be coiled for retracting the same and rigid metal cross pieces placed at intervals perpendicular to said axis surrounding and retaining the flexible strips in position when the mast is erected, and allowing the flexible strips to be drawn through them.

4:. An extensible and retractable mast composed of a plurality of flexible metal strips connected together at their upper ends, detachably assembled parallel to a com- I mon axis and at an angle one to another and adapted to be coiled for retracting the same; and rigid metal cross pieces placed at inter vals perpendicular to said axis surrounding and retaining the flexible strips in position when the mast is erected, and allowing the flexible strips to be drawn through them.

In testimony whereof we have signed our names to this specification in the presence of subscribing witnesses.

FRITZ J AEGER. ALEXANDER SIEXVERT. Witnesses to Fritz J aeger: LEONHARD LAHNE, MAX ENGEL. Witnesses to Alexander Siewert:

HENRY HAsPER, l/VOLDEMAR HAUP'I. 

